jan 1, 1911 - Ernest Rutherford : He disproved the plum pudding because he discovered that the only “solid" part of the atom is the atomic nucleus. In addition, he discovered that the nucleus of certain elements could be “disintegrated” by the impact of energetic alpha particles coming from some radioactive source.
Added to timeline:
Date:
jan 1, 1911
Now
~ 115 years ago